I am not familiar with the particular model of Sony TV that you have. I can answer genericaly:

There are a number of voltage regulators typicaly used on TV sets. These are usualy IC devices, or a complete descrete circuit. The purpose of these are to regulate voltages that are used to operate various circuits. Most sets can typicaly have anywhere from about five to maybe even a dozen or more throughout the set, depending on the sophistication of the model.

The regulators, like any part in the set can fail with age and use. Sometimes they are damaged from other components failing, or when a regulator fails, it can damage the circuit areas that it is suppying. When the set is being service, the tech must check for other failed parts.

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Related Questions:

Hello"D" power board is nothing, but its power regulator board itself. I think you are not handy to do the work with power regulator baords. It is dangerous to handle power boards to any TV without proper experience.

your tv has problem in the horizontal circuit caps in the horizontal circuit should be checked also the jungle ic.and the regulator in the power supply.have a tech repair your tv if your are not a tech. good luck.

Hello
Check the input fuse first. If it is blown, there will be some short inside the power regulator circuit. Usually Sony sets uses STR regulated power supply. You can see this STR, and Ic, screwed onto a heatsink. Replace it with a same type and number. Before replacing the STR, check the diodes used in that section for damage, mainlu zener diodes. They might get shorted along the blowing of the STR. Check that section throughly before resoldering the new STR.
If any further assistance you needs, get me through Fixya. Ok.

please try to check the board at the Jungle Chroma section, check the supply voltages tru Jungle IC then check the Regulator of Jungle power supply if this is 5, 8. or 12Volts. please check. if the requirements is same by the given regulator viltages.

The 7 blinks indicate an over voltage condition. The high voltage section has exceeded 33,000V. This is generally caused by a bad regulator. I don't have a listing for your model, but there should be a multi-pinned IC attachd to a heatsink marked STRxxx located close to where the AC cord comes into the set. Post the actual marking here and I'll get you the part number and cost. That is the regulator that may be the problem.

this problem would be in your power spply or the sweep derived power supply. probably a bad capacitor or regulator IC/transistor. Unless you know how to trouble shoot electronics them please have this set looked at by a pro. Good Luck